Aprilaire Humidifier model 800 User Manual

Model 800 Residential Steam Humidifier  
Model 800 Residential Steam Humidifier  
Installation & Maintenance Instructions  
Table of ConTenTS  
Safety Cautions                                                                                    2  
Materials list                                                                                       2  
Principles of operation                                                                      3  
Specifications & Dimensions                                                           3  
Installation Instructions                                                                     5  
Choosing a Location                                                                           5  
- Dispersion Tube                                                                            5  
- Humidifier                                                                                     7  
- Automatic Digital Humidifier Control                                          7  
Prepare Humidifier for Mounting                                                       8  
Mount Humidifier                                                                               8  
Steam Dispersion System                                                                  8  
Supply Water                                                                                      8  
Drain Line                                                                                            9  
Automatic Digital Control and Control Wiring                                  9  
Electrical Power Wiring & Shut-off Switch                                       9  
Start-up Procedure                                                                           11  
Sequence of operations                                                                  11  
operating Modes                                                                               11  
Display Panel                                                                                     12  
Maintenance                                                                                      13  
Troubleshooting Guide                                                                     14  
Replacement Parts                                                                            16  
ReaD anD SaVe THeSe InSTRUCTIonS  
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Expand Contents

PRInCIPleS of oPeRaTIon  
The Aprilaire® Model 800 Canister Steam Humidifier delivers  
humidity in the form of steam to the conditioned space via  
the HVAC system duct or optional Aprilaire Model 850 Fan  
Pack  The humidifier generates steam by energizing two  
electrodes that extend into a canister of water  Current  
flowing between the electrodes causes the water to boil,  
creating steam  Water is introduced to the humidifier through  
a fill valve to a fill cup located in the top of the cabinet  The  
fill cup serves as an overflow reservoir and provides an air  
gap between the humidifier and water source  The steam  
canister is filled from the bottom  The canister is seated  
in a drain cup assembly which includes a drain valve  The  
drain and fill valves work together to maintain water level  
in the canister to deliver the rated steam capacity based  
on the electrical conductivity of the water and to temper  
drain water  See figure 1 for representation of fill and drain  
system and canister  
fIGURe 1 – fill and Drain System and Canister  
Steam  
Outlet  
Fill Cup  
Overflow  
High Water  
Level Sensor  
Electrodes  
Flow Control  
Orifice  
Canister  
Steam is delivered into the airstream through a dispersion  
tube mounted in the HVAC system ductwork  Openings in the  
dispersion tube are fitted with “tubelets” which extend into  
the center of the tube  The design of the dispersion tube and  
tubelets distribute steam over a wide area in the duct and  
direct any condensed moisture back into the steam hose  
Fill  
Inlet  
Fill Valve  
Drain Valve  
Drain Cup  
Supply  
Water  
Drain  
90-1522  
SPeCIfICaTIonS & DIMenSIonS  
Table 1 – Specifications  
Maximum  
steam capacity  
nominal Current draw  
Humidifier unit  
operating weight  
(amps)  
Voltage  
kw  
gal/day  
11 5  
amps  
11 5  
11 5  
11 5  
lbs  
23  
23  
23  
120V  
208V  
240V  
1 4  
2 4  
2 8  
20 5  
23 3  
3
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SPeCIfICaTIonS & DIMenSIonS (ConTInUeD)  
fIGURe 2 – Humidifier & Dispersion Tube Dimensions  
3" Mounting Plate  
to first opening  
8 7/8"  
1 3/4"  
Fill Cup  
7 7/8"  
3" sq  
3 3/8"  
1 5/8"  
1" dia  
3 3/8"  
4 1/4"  
5 3/4"  
8 1/4"  
2" sq  
STEAM DISPERSION TUBE  
Electrical Knockouts  
Dispersion Outlet  
TOP VIEW  
10 1/8"  
7 1/8"  
4"  
1"  
Mounting  
Holes  
12"  
4"  
20 7/8"  
FRONT VIEW  
SIDE VIEW  
BACK VIEW  
Drain  
Water Fill Line Connection  
3 3/8"  
2"  
3 3/8"  
8 3/8"  
BOTTOM VIEW  
90-1518  
4
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InSTallaTIon InSTRUCTIonS  
CHooSInG a loCaTIon  
DISPeRSIon TUbe  
When choosing a location for the dispersion tube three things must be considered: Location in duct, elevation with respect to the humidifier, and  
distance from humidifier to dispersion tube  
Duct location  
The preferred location for the dispersion tube is in a supply duct because higher temperature air will more readily absorb the moisture  Whether  
installed in a supply or return, the dispersion tube must be in a straight section of duct to avoid turbulent air and must be far enough upstream  
of any obstruction or bends in the duct to allow the steam to be fully absorbed to prevent condensation  The exact distance from obstructions in  
the duct depends on air temperature, RH set point, and airflow velocity in the duct  Table 2 provides absorption distance for typical conditions  
The higher the RH setting, the longer the absorption distance  Warmer air shortens the absorption distance  If absorption distance is a concern,  
install dispersion tube in supply duct and configure humidifier and control to operate only during HVAC system heat call  Call Aprilaire Tech  
Support at 1-800-334-6011 for additional information on absorption  
The dispersion tube must be mounted on a vertical surface with the tube angled up  
If the dispersion tube is mounted on insulated ductwork, make sure insulation is not more than 2” thick at tube location to prevent insulation  
from blocking first steam outlet  
Table 2 – absorption Distance (Minimum distance from dispersion tube downstream to any obstruction or bend in duct)  
70°f & 30% RH  
Input  
Power  
Humidifier  
output  
70°f & 45% RH  
65°f & 45% RH  
airflow Velocity  
Setpoint  
Setpoint  
Setpoint  
300 fpm  
600 fpm  
1200 fpm  
1800 fpm  
300 fpm  
600 fpm  
1200 fpm  
1800 fpm  
300 fpm  
600 fpm  
1200 fpm  
1800 fpm  
7"  
3"  
11"  
6"  
13"  
7"  
120 V  
208 V  
240 V  
11 5 gal/day  
20 5 gal/day  
23 3 gal/day  
2"  
3"  
3"  
< 2"  
13"  
6"  
2"  
2"  
19"  
10"  
5"  
23"  
12"  
6"  
3"  
2"  
3"  
4"  
15"  
6"  
23"  
12"  
6"  
28"  
13"  
7"  
5"  
3"  
4"  
5"  
90-1524  
5
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InSTallaTIon InSTRUCTIonS (ConTInUeD)  
elevation  
The preferred location for the dispersion tube is higher than the humidifier so that the steam hose has a constant downward slope of at least 2”  
per foot from the dispersion tube to the humidifier  If hard pipe is used, the slope can be 1/4” per foot  With the constant downward slope, any  
condensation that forms in the steam hose will drain back into the steam canister  See figure 3  If the dispersion tube must be mounted below the  
humidifier or if the steam hose needs to run up and over an obstruction, a drip tee with drain trap must be installed as shown in figure 4  
fIGURe 3 – Dispersion Tube Mounted above Humidifier  
fIGURe 4 – Dispersion Tube Mounted below Humidifier  
Steam hose or pipe.  
Drip tee installation for piping over obstruction,  
or if dispersion tube is lower than humidifier.  
Insulate pipe with  
Dispersion tube  
1” fiberglass to  
reduce steam loss.  
90° long sweep  
or two 45° elbows  
90° long sweep  
or two 45° elbows  
Duct  
Insulate hard pipe to  
reduce steam loss  
Obstruction  
Drip tee  
6" min  
Drain trap  
8" min  
NOTES:  
1" air gap  
1. Refer to governing codes for  
drain pipe size and materials.  
2. Support steam hose so there  
are no sags or low spots.  
*Pitch steam hose down from dispersion tube to humidifier:  
2"/ft (15%) minimum when using steam hose.  
1/4"/ft when using hard pipe.  
Open drain  
required,  
see note 1.  
90-1521  
90-1520  
Distance from Humidifier to Dispersion Tube  
The capacity of the humidifier is reduced by the length of the steam hose or pipe due to condensation  The maximum recommended length  
of steam hose is 6 feet  Use hard pipe insulated with 1” fiberglass for lengths greater than 6 feet  Table 3 provides humidifier capacity with  
various lengths of steam hose and pipe  When splicing hard pipe to steam hose, use 1” O D  pipe  
Table 3 – Steam Humidifier Capacity in Gallons/Day  
Steam Hose  
or Insulated  
Pipe length  
120 Volts  
208 Volts  
240 Volts  
Steam Hose  
Insulated Pipe  
Steam Hose  
Insulated Pipe  
Steam Hose  
Insulated Pipe  
< 2 ft  
2 ft  
11 5  
11  
10  
9
11 5  
11  
11  
11  
10  
10  
10  
9
20 5  
20  
20 5  
20  
20  
20  
19  
19  
19  
18  
18  
18  
18  
23 3  
23  
23 3  
23  
23  
22  
22  
22  
22  
21  
21  
21  
20  
4 ft  
19  
22  
6 ft  
18  
21  
8 ft  
10 ft  
12 ft  
14 ft  
16 ft  
18 ft  
20 ft  
9
9
9
6
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InSTallaTIon InSTRUCTIonS (ConTInUeD)  
HUMIDIfIeR  
fIGURe 5 – Clearances  
Mount humidifier in a location where ambient temperature does not  
exceed 120°F or where freezing temperatures may occur  
16" for  
Steam  
Hose  
Mount humidifier in a location that allows access for servicing, and  
clearance to remove front panel for replacing the canister and side  
panel for access to the electrical components during installation  
See figure 5 for minimum clearances around humidifier  
FRONT VIEW  
The humidifier should be mounted as close to the dispersion  
tube as possible  Table 3 shows how capacity is reduced as the  
distance between the humidifier and dispersion tube increases  If  
the humidifier is mounted on the duct directly below the dispersion  
tube, allow space for a bend in the steam hose  
16" for  
Electrical  
Access  
30" for  
Service  
Access  
4"  
The humidifier can be mounted to a wood surface, or to sheet metal  
ductwork if it is structurally stable  Do not mount humidifier to fiber  
duct board  
SIDE VIEW  
The humidifier must be mounted to a vertical surface and must be  
mounted level in the upright position  
16"  
for Drain  
Do not mount humidifier near sources of electromagnetic emissions  
such as power distribution transformers  
90-1519  
aDHC (aUToMaTIC DIGITal HUMIDIfIeR ConTRol) MoDel 62  
The ADHC must be mounted in the return air duct at least 6” upstream of any fresh air intake ducts or sources of moisture (steam dispersion  
tube if it is in the return ) Follow instructions provided with the control  
If the application requires a wall-mounted control in the conditioned space, use Aprilaire Part #4993, which includes a wall-mountable manual  
humidistat, a relay to activate the HVAC blower, and wiring instructions  
7
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InSTallaTIon InSTRUCTIonS (ConTInUeD)  
PRePaRe HUMIDIfIeR foR MoUnTInG  
Unpack carton  Open front panel by removing screw and lifting panel up and away from humidifier  Disconnect three wires from top of canister  
by pulling straight up  The two large wires are the electrode conductors  The smaller wire is connected to the high water level sensor  Remove  
canister by twisting and pulling it up and out of drain assembly  Remove two screws on right side of humidifier and lift side panel off housing to  
expose electrical compartment  
InSTall STeaM DISPeRSIon TUbe  
note: If humidifier will deliver steam via the Model 850 Fan Pack instead of the dispersion tube, follow instructions included with Fan Pack  
Make sure steam dispersion tube is mounted higher than the humidifier so that condensate that forms in the tube runs back into the canister  
If the dispersion tube cannot be mounted higher than the humidifier or if the steam hose must extend up from the humidifier then down to the  
dispersion tube due to an obstruction, a drip tee and drain trap system must be installed as shown in figure 4  
Drill a 1-1/4” diameter hole in a vertical surface of the duct at the location chosen for the dispersion tube  Position the tube so it is angled up  
Secure with four sheet metal screws provided  
MoUnT HUMIDIfIeR  
Secure humidifier to wood surface using screws provided, or to sheet metal duct  If mounting to stud frame wall, install two spanner boards to  
studs and fasten humidifier to spanner boards  Make sure humidifier is mounted plumb  
Verify that the o-ring is in place in the slot in the drain assembly  Dampen the o-ring with water, then reinsert canister  (Do not use oil, grease or  
any lubricant besides water ) Rotate the canister so the caution label is visible  Reattach the electrode conductors (interchangeable) and the high  
water level sensor wire  
InSTall STeaM HoSe  
Six feet of steam hose is provided with the humidifier  If the steam hose must be cut, use a hacksaw  If additional length is required, use  
1” O D  metal or copper pipe  Do not use PVC pipe for steam line. Insulate pipe with 1” thick fiberglass to reduce steam loss  See Table 3 for  
humidifier capacity at various lengths of steam hose and pipe  
Use the steam hose provided  Other hoses may have impurities which can cause foaming in the canister  Foaming can cause water level  
inaccuracies and reduced steam production  When using pipe, remove all traces of residual materials used to connect the pipe to prevent foaming  
Attach steam hose to dispersion tube and then to top of canister using hose clamps provided  Make sure steam hose has a constant slope of  
at least 2” per foot between the dispersion tube and the humidifier  Any and every low spot in the steam hose or pipe must have a drip tee and  
drain trap  Fill drain trap with water before making final connections  
SUPPly waTeR  
Plumb the humidifier to cold tap water  Do not use hot water because unheated supply water is used to cool water drained from the  
humidifier. To operate properly, water conductivity must be within the range of 125 to 1,250 uS/cm (micro Siemens per centimeter), which is  
roughly equivalent in hardness to 3 to 36 grains per gallon  Do not use demineralized water  The humidifier will produce steam immediately as  
long as the mineral content of the water is within the specified range  For proper operation, supply water pressure must be between 25 psi and  
120 psi  
Supply water piping must be free of oils, lubricants, solder flux and other contaminants, which can cause foaming in the canister that can lead to  
water sputtering from the dispersion tube into the duct  
Install the saddle valve according to the instructions printed on the bag  Run ¼” copper tubing from the saddle valve to the humidifier  Extend the  
tubing up through the port in the bottom of the humidifier and connect it to the fill valve  Double wrench to prevent leaking and damage to valve  
8
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InSTallaTIon InSTRUCTIonS (ConTInUeD)  
DRaIn lIne  
Attach the 7/8” I D  drain tubing provided to the drain assembly at the bottom of the humidifier  Secure with the hose clamp provided  Do not  
over tighten  
Make sure the drain line has a constant downward slope from the humidifier to the drain and is not kinked or blocked  
aUToMaTIC DIGITal ConTRol anD ConTRol wIRInG  
The control circuit operates on 24VAC  
The ADHC (Automatic Digital Humidifier Control) Model 62 must be mounted in the return air duct at least 6” upstream of any fresh air intake  
ducts or sources of moisture (steam dispersion tube if it is in the return ) Follow instructions provided with the control  Connect “H” terminals on  
ADHC to “HUMIDISTAT” terminals on humidifier circuit board  
If protection from over-humidification is desired, install optional high humidity limit switch #4594 at least 4 feet downstream of the dispersion  
tube  If airflow verification is desired, install optional airflow proving switch #4592 in duct  The high humidity limit switch and the airflow proving  
switch are wired in series with the ADHC (humidistat) circuit  
eleCTRICal PoweR wIRInG & SHUT-off SwITCH  
CaUTIon  
Only qualified electrical personnel should perform field wiring procedures. Improper wiring or contact with energized circuits  
can cause property damage or severe personal injury.  
All wiring must be installed in accordance with all governing electrical codes and with the wiring diagram provided inside the front panel  
Power wiring must be rated for 105°C (220°F)  
Do not loop power wiring  
Do not use aluminum wire  
A safety grounding system that meets all governing electrical codes is required  The ground connection must be made with solid metal to metal  
connections  Ground wire must be the same size as the power wiring  
Humidifier draws 11 5 amps 10%  Use12 7 amps when sizing circuit  
The Model 800 Steam Humidifier can operate with 120, 208 or 240 VAC  If using 208V or 240V, remove jumper between n and l2  
terminals on power terminal block.  
When wiring to 208 or 240 V, run two conductors plus neutral plus ground  
wIRInG InSTRUCTIonS  
Install disconnect switch (not provided) between line power source and humidifier  
Knock-outs for power wiring and low voltage control circuit wiring are located on the top of the humidifier  
Connect power and ground wiring as shown in wiring diagram, figure 6  
Do not run high voltage power lines over internal circuit boards  
9
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InSTallaTIon InSTRUCTIonS (ConTInUeD)  
fIGURe 6 – wiring Diagram  
FOR 120V INSTALLATION,  
CONNECT POWER TO L1 AND N  
WITH N-L2 JUMPER IN PLACE  
(PROVIDED).  
MAIN POWER SWITCH  
(NOT PROVIDED)  
FOR 208 OR 240 VOLT  
INSTALLATIONS,  
REMOVE N-L2 JUMPER,  
TERMINAL  
BLOCK  
L1  
N
L2  
AND CONNECT POWER TO L1, N, AND L2  
RED  
POWER RELAY CONTACTS  
BLK  
6
8
RED  
BLK  
2
4
BLK  
WHT  
YELL  
120V AC  
24V AC  
TRANSFORMER  
75VA  
YEL/WHT  
CONTROL PCB CURRENT SENSING PCB  
J11-1  
J11-2  
J13-1  
J13-2  
J1-1  
J1-2  
J3-1  
J3-2  
J2  
BLU  
WHT  
BLU  
+24V DC  
+24V DC  
WHT  
BLK  
AUTOMATIC DIGITAL  
HUMIDITY CONTROL  
(PROVIDED)  
HIGH LEVEL PROBE  
YEL  
J4  
J12-1  
J12-2  
FAN PACK  
(OPTIONAL)  
WATER LEVEL  
PROBE  
+24V AC  
COM  
J1-1  
J1-2  
ELECTRODE  
ELECTRODE  
POWER RELAY COIL  
24V AC  
COM  
J7  
J8  
BRN  
BRN  
YEL  
YEL  
BLK  
1
0
STEAM CYLINDER  
24V AC  
COM  
J6-1  
J6-2  
J4  
FILL VALVE  
24V AC  
COM  
DRAIN VALVE  
SAFETY SWITCH  
J3  
BLK  
HIGH VOLTAGE WIRING  
YEL/WHT  
J2  
24V AC  
COM  
CONTROL CIRCUIT WIRING  
YEL  
J5  
ORG  
FIELD WIRING  
DISPLAY PANEL  
J10-1  
J10-2  
RIBBON CABLE  
STATIC  
DISCHARGE  
GROUND  
90-1515  
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STaRT-UP PRoCeDURe  
See.“Sequence.of.Operation”.and.Operating.Modes”.for.explanation.of.humidifier.operation  
1 . .Once.the.supply.water,.drain,.steam.hose.and.electrical.power.and.control.wiring.connections.are.complete,.reattach.the.side.panel.and.the.  
front.panel .  
2 . .Open.the.saddle.valve.allowing.water.to.flow.to.the.humidifier .Check.for.leaks  
3 . .Close.the.main.power.switch  
4 . .Turn.humidifier.on.by.pressing.“On/Off”.button.on.front.panel .The.green.“On/Off”.light.will.turn.on  
5 . .Make.sure.the.HVAC.blower.is.operating.(or.the.ADHC.is.set.to.call.the.blower).and.adjust.the.ADHC.dial.up.to.initiate.a.call.for.humidity .  
.
.
.note:.The.ADHC.can.be.placed.into.“TEST”.mode.to.force.a.call.for.humidity.but.this.will.only.last.for.one.minute  
.The.“Fill”.light.will.be.illuminated.indicating.that.the.fill.valve.is.open.and.the.canister.is.filling .The.“Steam”.light.will.also.turn.on.indicating.  
that.the.humidifier.is.receiving.a.call.for.humidity  
6 . .Verify.that.steam.light.turns.on,.then.turn.unit.off .“On/Off”.light.will.turn.off.and.“Drain”.light.will.flash.green .Water.will.drain.from.humidifier  
7 . .Once.light.stops.flashing,.sequence.is.complete.and.unit.can.be.turned.on.again.for.normal.operation  
8 . .Set.ADHC.to.appropriate.level  
note:.If.the.conductivity.of.the.water.is.not.within.the.125.to.1,250.uS/cm.range,.the.humidifier.may.run.through.a.series.of.drain.and.fill.cycles.  
to.condition.the.water.into.that.range .This.process.may.take.up.to.96.hours .See.explanation.of.display.panel,.Table 4,.and.operating.modes  
SeqUenCe of oPeRaTIon  
When.the.Automatic.Digital.Humidifier.Control.(ADHC).detects.RH.below.the.set.point,.and.provided.the.humidifier.is.turned.on.and.the.HVAC.  
system.blower.is.operating,.the.internal.controller.in.the.humidifier.energizes.the.electrodes.and.measures.the.current.flowing.through.the.water.  
between.them .The.controller.adjusts.water.level.in.the.canister.via.a.fill.valve.and.a.drain.valve.to.maintain.current.at.11 5.amps. .1 2.amps .  
The.operating.water.level.in.the.canister.depends.on.the.mineral.content.of.the.water.which.determines.conductivity  
The.ADHC.has.the.ability.to.turn.on.the.HVAC.system.blower.if.the.homeowner.or.installer.chooses.to.utilize.that.feature .See.ADHC.installation.  
manual  
oPeRaTInG MoDeS  
When.the.humidifier.is.powered.and.turned.on,.the.“On/Off”.light.is.illuminated.green  
Any.time.the.fill.valve.is.activated,.the.“Fill”.light.illuminates.green  
Any.time.the.drain.valve.is.activated,.the.“Drain”.light.illuminates.green  
During.initial.start.up.with.a.new.canister,.the.humidifier.may.run.through.a.series.of.fill/drain.cycles.until.the.conductivity.of.the.water.is.in.a.  
range.that.allows.normal.operation .During.this.time,.the.“Steam”.light.illuminates.green .If.the.humidifier.cannot.produce.steam.at.the.rated.  
level.after.trying.for.48.hours,.the.“Steam”.light.illuminates.yellow .The.humidifier.continues.to.attempt.to.produce.steam.at.the.rated.level.for.  
another.48.hours.in.this.mode .If.the.humidifier.cannot.produce.steam.at.the.rated.level.in.a.total.of.96.hours,.the.“Service”.light.will.flash.red  
The.conductivity.of.naturally.soft.water,.hard.water,.and.softened.water.changes.as.the.water.heats.up,.but.the.controller.adjusts.the.water.  
level.to.maintain.a.nominal.current.of.11 5.amps. .1 2.amps.between.the.electrodes .Over.the.life.of.the.canister,.minerals.that.build.up.on.the.  
electrodes.will.reduce.their.effective.surface.area.and.affect.the.resistance.between.them .The.operating.water.level.will.increase.with.use.until.  
it.reaches.the.high.water.level.probe .At.that.point,.the.“Service”.light.will.flash.red.indicating.that.the.canister.needs.to.be.replaced  
When.the.humidifier.is.operating,.the.“Steam”.light.on.the.front.illuminates.green .If.the.internal.controller.attempts.to.make.steam.but.the.water.does.  
not.contain.enough.minerals.to.be.conductive,.the.water.level.in.the.tank.will.reach.the.high.level.point.and.the.“Steam”.light.will.illuminate.yellow .  
Any.time.power.is.disconnected.or.humidifier.is.turned.off,.the.internal.timer.for.start-up.and.drain.cycles.is.reset  
If.the.humidifier.has.operated.168.hours.without.a.drain.cycle,.the.drain.valve.will.open.and.drain.the.canister .Normal.operation.will.continue  
If.the.humidifier.is.operating.and.a.power.failure.occurs,.once.power.is.restored,.the.“On/Off”.light.will.flash.green.for.one.minute,.then.the.  
humidifier.will.turn.on  
enD of SeaSon/PeRIoD of InaCTIVITy SHUT-Down  
If.the.humidifier.does.not.receive.a.call.to.operate.in.72.hours,.the.controller.drains.the.canister .The.humidifier.will.resume.normal.operation.  
when.a.call.for.humidity.is.made  
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DISPlay Panel  
Table 4 – Display Panel  
Icon  
function  
Main.switch .Press.to.turn.humidifier.on.and.off  
Resets.timer.for.start-up.water.conditioning  
Solid.green.when.humidifier.is.turned.on .  
light  
Flashes.green.for.one.minute.once.power.is.restored.if.humidifier.was.operating.when.power.was.shut.off  
Fill.valve.indicator  
Solid.green.during.normal.operation.when.canister.water.is.being.replenished  
light  
light  
Flashes.green.(along.with.Drain.light).indicating.fill.and.drain.valves.are.pulsing.to.dislodge.mineral.deposits  
Solid.red.if.canister.needs.water.but.water.is.not.detected .See.Troubleshooting.Guide  
Indicates.call.for.humidity  
Solid.green.during.call.for.humidity  
Solid.yellow.if.humidifier.cannot.reach.nominal.output.within.first.48.hours.of.operation.due.to.insufficient.water.conductivity .  
Humidifier.will.continue.to.cycle.valves.in.an.attempt.to.reach.capacity.for.an.additional.48.hours .Approximately.1/10.  
teaspoon.of.table.salt.can.be.added.to.fill.cup.to.increase.conductivity.of.water  
Drain.valve.indicator  
Solid.green.to.indicate.start.of.drain.cycle .  
Drain.cycle.occurs:.  
1).To.maintain.nominal.steam.output.during.normal.operation .  
2).During.end.of.season.shut.down .(End.of.season.shut.down.occurs.after.72.hours.of.inactivity )..  
3).If.humidifier.has.operated.for.168.hours.without.a.drain.cycle ..  
4).When.humidifier.is.turned.off .  
light  
Flashes.green.(along.with.fill.light).indicating.drain.and.fill.valves.are.pulsing.to.dislodge.mineral.deposits  
Flashes.green.when.humidifier.is.turned.off.indicating.canister.is.draining .When.flashing.stops,.main.power.disconnect.  
can.be.turned.off.and.front.panel.can.be.opened  
Indicates.canister.needs.to.be.replaced.or.humidifier.requires.other.type.of.service  
Flashes.red.when.canister.can.no.longer.supply.demand.and.needs.to.be.replaced.because.electrodes.have.been.corroded.  
or.coated.with.mineral.deposits .Humidifier.may.continue.to.generate.steam.but.at.a.reduced.capacity  
Flashes.red.if.humidifier.with.new.canister.cannot.generate.steam.due.to.insufficient.water.conductivity.after.96.hours.of.  
drain/fill.activity .Approximately.1/10.teaspoon.of.table.salt.can.be.added.to.fill.cup.to.increase.conductivity.of.water  
light  
Solid.red.if.controller.detects.over-current.between.electrodes .Causes.may.include.electrodes.coated.with.mineral.  
deposits,.blocked.drain,.or.defect.in.drain.valve.circuit .See.Troubleshooting.Guide  
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MaInTenanCe  
CaUTIon  
• Allow humidifier to drain and disconnect power before servicing.  
• Service should be performed by a qualified HVAC technician.  
Inspect.humidifier.when.servicing  
• Check system operation and inspect all plumbing connections and piping for signs of cracks or leaks.  
• Inspect drain line to make sure it is not blocked and has constant downward slope. Clean or replace if necessary.  
• Inspect steam hose to make sure it has no low spots and has constant upward slope from humidifier to dispersion tube in duct. If dispersion  
tube.is.mounted.below.humidifier,.inspect.drip.tee.and.drain  
To RePlaCe THe CanISTeR  
Replace.the.canister.annually.and.when.prompted.by.the.“Service”.light .Use.Only.Genuine.Aprilaire.Model.80.Canister  
1 . .Press.On/Off.switch.to.turn.humidifier.off  
2 . .Allow.humidifier.to.drain .When.the.green.“drain”.LED.stops.flashing,.disconnect.main.electrical.power.to.humidifier  
3 . .Remove.front.panel  
4 . .Pull.three.wires.off.posts.on.top.of.canister .(Two.large.electrode.conductors.and.one.water.level.probe.conductor )  
5 . .Loosen.hose.clamp.at.top.of.canister  
6 . .Slide.hose.off.top.of.canister  
7 . .Slide.canister.up.and.out.of.drain.assembly .Discard.canister  
8 . .Remove.o-ring.from.drain.assembly.using.small.screw.driver  
9 . .Inspect.drain.assembly.and.remove.any.debris .See.drain.valve.cleaning.procedure  
10 . .Insert.new.o-ring.into.slot.in.drain.assembly .(O-ring.is.provided.with.Model.80.canister ).Dampen.o-ring.with.water.before.inserting.canister .  
Do.not.use.oil,.grease,.or.any.lubricant.besides.water  
11 . .Make.sure.strainer.is.inserted.into.bottom.of.new.canister  
12 . .Insert.canister.into.drain.assembly .Position.canister.with.label.facing.outward  
13 . .Slip.steam.hose.over.top.of.canister.and.tighten.hose.clamp  
14 . .Reattach.three.wires.to.posts.on.top.of.canister .(Larger.electrode.conductors.are.interchangeable )  
15 .